There are absolutely 0 parallel lines in any given triangle.
10000000000
None but all three sides are equal in length.
2
None
None
10000000000
None but all three sides are equal in length.
A square has two pairs of opposite parallel lines whereas a triangle has none.
ZERO!
None
None
2
There can be only one pair of perpendicular lines in an isosceles triangle when it is a right angled isosceles triangle. A non right angled isosceles triangle has no pairs of perpendicular lines.
None
A triangle can never have any parallel sides.
A triangle has no sides parallel to each other.
None because no triangle has any parallel sides.